Sand blender



06f. 14, 1947.' w, P MLl'lR ETAL 2,428,852

SAND BLENDER Filed Decfls, 194s Patented Oct. 14, 1947 291,228,852- SAND B LENDER William P. Muir, Toronto, vand Robert H. Mac- Innes, St. Catharines, Ontario, Canada; said MacInnes assigner to said Muir Application December 18, 1943, Serial No. A514,868

This invention relates to improvements in ma chines for blending sand, clays or other pulverized materials so that all lumps or coherent masses will be broken down and foreign matter, such as stones, bits of wood or metal, will be removed therefrom.

The principal object of the invention is to provide a machine which may be operated at high speed to agitate and comb the pulverized materials so that they will be thoroughly mixed and dis-y charged therefrom to form a smooth and uniclass described in which the surface is formed of rubber or rubber composition with spacedapart projections capable of being drawn through a mass of pulverized material to pick out and comb the material, to break down coherent masses and to force the pulverized material between the separate flexible fingers of an obstructing curtain arranged adjacent to said belt at the discharge end of the machine.

In the accompanying drawings Figure 1 is a longitudinal vertical part mid-section through a sand blending machine constructed in accordance with this invention.

Figure 2 is a transverse sectional View taken through the machine on the line 2-2 of Figure 1.

Figure 3 is a plan view of one form of a belt devised for use in this machine.

Figure 4 is a plan View of the preferred form of belt. f

Figure 5 is a cross sectional view of the belt illustrated in Figure 4.

Figure 6 is an enlarged longitudinal sectional'v of metal broken from a casting or from a gate,

3` Claims. (Cl. 209--92) and so also pieces of stone, wood or other foreign matter mayV get into the sand.

It is important that the sand that has been used should be broken down and free from all lumps and pieces of foreign material should be removed therefrom, and the pulverized material should be thoroughly blended so that clays and sand will be thoroughly mixed wherever such are present.

Sand blenders have been commonly used and these utilize an endless belt which forms the bottom of a hopper, and the belt which has been used has been formed of leather or fabric studded with nails or spikes to act as combing media to engage and break down the lumps of coherent material found in the mass.

' The present invention proposes to utilize substantially the same construction of machine as has been hitherto used but proposes an entirely new form of belt for combing, separating and discharging the pulverized material.

Asillustrated in the accompanying drawings a portable frame 'I is mounted on wheels 2 and carries a vsteep angularly disposed platform 3 which rises from the rear end of the machine.

A pair of drums 4 and 5, mounted on shafts E and I respectively which are journalled in the side framey of themachine, support and endless belt 8 which extends around the perimeters of the drums and is preferably formed of a flat body structure' which is suitably reinforced with fabric lor woven wire I0, and at either side the belt is formed with upstanding flanges II. Between the anges are arranged transverse rows of upwardly projecting teeth or studs I2, which as shown in Figures 4, 5 and 6, are of rectangular form and preferablyhave the forward edges I3 extending right angularly from the face of the belt, while the rear walls I4 slope from the face of the belt upwardly to the rectangular top.

The side walls of each of the toothed members I2 are preferably slightly sloped to enable the belt to be cleared from the mould in which it is made, and the teeth of alternate rows are preferably staggered, as illustrated particularly in Figure 4, so that the spaces between each pair of teeth in one row are obstructed by the teeth in the next succeeding row. This staggered arrangement of the teeth permits the teeth to engage the mass of sand I5 which is placed on top of the belt between the sloping side walls I6 of the machine. These sloping side walls extend close to the edges of the side flanges I I of the belt and sand that is placed between the side walls falls in between the side anges II and is engaged by the alternate be abrasive sand or sand mould or even clay, and

the engagement of the teeth I2 with particles of stone or wood or other foreign matter, which may get into the sand mass, forces the same 4outwardly so that they work back to the lower inclined end where the sand is held by the tiltable back board I8.

Such coarse particles of material, stone,;bits of metal or wood may be released from the mass above from time-to-time in the operation of the machine by tilting the board I8to raise the bottom edge from the belt, allowing the larger particles to fall clear of the belt.

As the combing teeth l2 engage and break down the mass of sand placed in the machine they carry a quantity of the broken-down material in front of each of the teeth, and the material thus carried along is projected with considerable impetus from the fast revolving belt. v

In order that large masses of the pulverized material shall not be carried forward and delivered from the belt unequally, a screen member I9 is arranged at the upper end of thesmachine. This is adjustable and has mounted on its lower edge a depending curtain which is preferably formed of a sheet of rubber having its lower edge cut to form a plurality of fingers, and these fingers being flexible yield to the material being carried by the belt, permitting a certain height of material to be carried by the toothed belt past the barrier. The flexible rubber fingers act as a comb to spread out the top surface and keepit uniform. Thus the delivery from the machine is in the form of a uniform sheet of pulverized material which is directed by an adjustable chute 2|.

The main feature of the idea -rests in the formation of the rubber belt with a plurality of teeth arranged in rows in offset staggered relation. A modified form of this idea is illustrated in Figure 3 in which the teeth 22 are of diamond-shaped form and divide the material under which they are passing into separated streams which work back and forth to cause effective intermixing of the'particles to blend the mass.

The device has been found in operation to be extremely practical and it is a very distinct advance over any form of belt hitherto used in sand blenders.

The device is described as being zused particularly with moulding sand but it will be understood that it may be used with other materials of pulveri'zed or grannular form which it is desired to blend into a uniform dry mixture.

What we claim as our invention is:

1. In a sand blending machine, the combination with a frame and an angularly disposed sand receptacle, rollers arranged at the opposite ends of said frame beneath said receptacle, of an endless rubber belt mounted on said rollers and forming a bottom for said sand receptacle and having moulded integrally therewith on its outward face a'plurality of teeth arranged in spaced-apart parallel rows, the teeth of each row being spaced apart and arranged in longitudinally staggered relation to the teeth of adjacent rows to effect a .forceful lateral dispersal of sand by each tooth as Vthe belt rotates.

2. In a sand blending machine, the combination with an angularly disposed frame, a hopper having inclined side walls, and transverse rollers mounted at each end of the bottom of said hopper, of a fabricated rubber belt having longitudinal side iianges extending below said hopper side walls, and rows of regularly transversely spaced teethformed integral therewith, the teeth of each row` being arranged in longitudinal-ly staggered relation to the teeth of adjacent rows, each tooth in each row overlapping the space between the teeth in the adjacent row to effect a dispersal of the sand as the belt rotates.

l3. In a sand blending machine, the combination with a frame and al sand receptacle mounted in an inclined position thereon, of rollers arranged transversely of said frame beneath said receptacle, an endless rubber belt mounted on said rollers and forming the bottom for said receptacle, said belt having upwardly projecting side flanges, and rows of transverse rectangular-shaped lteeth moulded integrally therewith and spaced apart, the teeth of each succeeding row being staggered inrelation to the teeth in a preceding row, said teeth having hat front surfaces arranged perpendicular to the surface of the belt and bevelled back surfaces.

WILLIAM P. MUIR. ROBERT H. MACINNES.

REFERENCES CITED The following references are of record inthe le of this patent:

UNITED STATES PATENTS Number Name Date 2,228,977 Rogers Jan. 14, 1941 404,011 McDermott May 28, 1889 788,839 MacDonald May 2, 1905 2,168,515 Davies Aug, 8, 1939 1,033,713 Lipley July 23, 1912 874,982 Norton Dec. 31, 1907 810,510 Robins, Jr Jan. 23, 1906 1,675,049 Perkins June 26, 1928 163,213 Kurth May 11, 1875 356,450 Coleman Jan. 25, 1887 1,190,950 Piepg-ras et al July 11, 1916 FOREIGN PATENTS Number Country Date 528,097 Great Britain Oct. 22, 1940 

